Rotary pressure-motor.



P. T. COPPIBLD.

ROTARY PRESSURE MOTOR.

APPLICATION FILED MAR, 190s.

926,689. Patented Jim@ 29,1909.

H5@ J6 jf 'wirmmo 5 6,1 MM jjzg. 2. Q

rn: voulus Psrsxs cu., wAsmNaroN, n. 1:A

'UNITED STATES PATENT OFFICE.

PETER T. COFFIELD,`OF DAYTON, OHIO, ASSIGNOR TO THE OOFFIELD MOTOR WASI-IER OOM- PANY, OF DAYTON, OI'IIO, A CORPORATION OF OHIO.

ROTARY PRESSURE -MOTOR.

Speeicaton of Letters Patent.

Application filed March 9, 1908.

Patented .Tune 29, 1909.

Serial No. 419,903.

To all whom it may concern:

Be it known that I, PETER T. COFFIELD, a citizen of the United States,residing at Dayton, in the county of Montgomery and State of Ohio, haveinvented certain new and useful Improvements in Rotary Pressure-Motors;and I do declare the following to be a full, clear, and exactdescription ofthe invention, such as will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the acconn panying drawings, and to the letters and Iigures ofreference marked thereon, which form a part of this specification.

This invention relates to certain specific improvements in rotary watermotors with particular reference to the rotary water pressure motorheretofore patented to myself, February 4, 1908, No. 878,044.

The present improvements relate particularly to the construction of thedrivers or swinging valves, and to the construction of the double pistonand the manner of attach ing it with the rotating shaft or cylindricalbody which supports said piston. The object of the improvements relatingto the drivers or valves is to free said drivers or valves from anyrigidity that might possibly interfere with said drivers or valvesreadily finding their seats and properly settling upon said seats. Theobj ect of the improvements relating to the piston and the manner ofconnecting it with its supporting shaft, is to obviate the difficulty inconstructing said parts in one integral piece, and to lessen the laborand expense due to machine work which are incidental to these parts whenthey are con# structed in one integral casting.

A further object of the present improvements is to provide a series ofauxiliary exhaust ports in the rotating shaft or cylinder which travelin advance of the main exhaust port and which relieve the pressure ofthe valves as each valve is passing. The valves reach the smaller orauxiliary ports 'first in the rotation of the piston, and as the mainexhaust port reaches said valves, the pressure is reduced to such anextent as to not interfere with a proper operation of the valves.

Preceding a detail description of my improvements, reference is made tothe accompanying drawings, of which- Figure 1, is a longitudinalsectional view on the line l) l of Fig. 2. Fig. 2, is a cross sectionalview of Fig. 1, on the line a a.

In the following description or specification of my improvements,similar reference characters indicate corresponding parts.

The cylindrical motor casing 1, is provided with oppositelydisposedpockets or chambers 3. One end of the motor :asing is provided with anintegral head 2 into which the chambers or pockets 3 extend and thusprovide end pockets il which communicate with the pockets 3 in thecasing. The other end of the motor casing is inclosed by a detachablehead 3 which has similar pockets 4 which communicate with the pockets 3at that end of the motor.

Mounted in each of the pockets 3 and extending into the pockets l in theheads of the motor casing, is a driver or valve, which in the presentcase, is constructed of two parts 5 and 6. The VIirst-named of theseparts is the seating portion of the valve which is provided with therequisite Ilexible material, such as leather 7, which is held 'firmlybetween the plates 5 and S which constitute the valve or driver proper.The connection between the two portions of each valve consists of a pin9 which penetrates an apertured boss 1() on an extended portion of thehinged member 6 of said valve, and bosses 11 on the seating portion ofthe valve. It is essential that this connection. between the two partsof each valve shall be loose to a certain extent in order that theseating or engaging portion 5 of the valve shall be free from rigidityand thus enabled to have a certain amount of llexibility in order thatit may properly seat. This requisite llexibility is provided by makingthe aperture in the boss 1() slightly larger than the pin f). The hingedportion (3 of each driver or valve has an aperturcd boss 12 at each endthrough which a pin 13 passes loosely, one end of said pin beingsupported in the head, and the other end being supported in thedetachable head through which it projects and is fitted with a nut 15which serves to hold said pin in position between the two heads of themotor casing with the ends of the valves extended into the pockets el asbefore indicated. Around the pin 13 of each driver or valve is a helicalspring 14 which exerts inward pressure upon each valve by having one endthereof extended in engagement with the hinged portion of said valve.These valves operate in and out of the pockets substantially in themanner described in my prior patent, and the improvements hereinspecified do not vary the functions of the same. The cylinder or shaft1n is also substantially the same as in my prior patent, but in thepresent case, is separate from the piston. A division wall 17 separateslongitudinally two chambers, to-witnlS and 19, the former of which hasan outlet to the motor through a port 20, and an inlet from the feedpipe 21 through a port 22 near one end of the shaft. The chamber 19receives the exhaust from the motor through a series of auxiliary oradvancing exhaust ports 23 and a main exhaust port 2e in the rear of theauxiliary or advancing exhaust ports 23.

he double piston consists of metallic member having two arms orextensions 25 which are united by a base portion 26 through which asuitable number of screws 27 penetrate and secure said piston at itsbase to the shaft 16 on one side of the inlet port AO. Suitable leathers2S are held firmly in position on the outer sides of the piston by meansof plates 29 and 30 and screws penetrating' the leathers and the wallsof the piston. The outer edges of these leathers are faced or turnedover in a manner to provide a suitable packing between the walls of themotor casing and the piston. The plate 30 inclosing one side of thepiston is provided at its inner end with in-turned portion or hook 31which is projected into the inlet port 2O and engages the adjacent edgeof the shaft, which edge forms one of the margins of the inlet port. Thepiston is thus secured to the shaft 16 by this connection and by meansof the connection' between the base of the piston as before indicated.lt will be seen that the piston occupies the portion or space upon themotor shaft which lies between the inlet port 20 and the main exhaustport 24. ln the rotation of the piston due to the inlet of the motivefluid through the port 20, such fluid is constantlyT trapped between therear side of the piston and the inwardly-lying valve, and the pressurethereof is exerted with maximum force to rotate the piston in thedirection indicated by the arrow C in Fig. 2. lfilhen the auxiliary oradvanced exhaust ports 23 reach each valve, the initial escape orexhaust of the motive fluid relieves the pressure of the valve as saidports are passing and thus the main exhaust port passes each valve witha reduced pressure due to the relief of the exhausting fluid throughthe' ports 23. The end of the motor shaft through which the motorreceives and exhausts, is provided with packing 32. These two packingmembers are conveniently held apart during the shipment of the motor andat other times when the motor is not in actual service, by means of ahelical spring provided with a packing member 35 which surrounds thatportion of the motor shaft and is held in position by a cap nut 36.

l claim:

1. in a rotary pressure motor, the combination with a shaft having twonon-comi municating chambers for thc inlet and exhaust of the motivefluid, said shaft having a port providing an inlet from the inletchamber to the motor, and a piston attached to said shaft, said pistonhaving a portion thereof extended in to the inlet port in the shaft andengaging the interior side of the shaft adjacent to the inlet port,substantially as specified.

2. ln a rotar Y pressure motor, the co1nbination with a shaft having twonon-communicating chambers for the inlet4 and the exhaust of the motivefluid, said shaft h aving a main inlet port forming a communicationbetween tgie inlet chamber in the shaft and the motor, a piston havingtwo extended portions provided. with suitable packing, and an extendedportion of said piston lying within the inlet port and engaging theshaft on the interior thereof.

3. ln a rotary pressure motor, a casing having pockets therein, driversor swinging valves located in saidv pockets, each of said drivers orvalves comprising two members flexibly connected in a' manner to enableone member of the valve to properly seat, a pin penetrating portions ofthe other member of each of said valves and the heads of the motorcasing, said pins forming a hinge for each valve as a whole, a springsupported upon said pin. and exerting an inward pressure on said valve,a motor shaft having a main exhaust port and a series of auxiliaryexhaust ports moving in advance of the main exhaust port to relieve thepressure of each valve in passing the exhaust port.

e'. ln a rotary pressure motor, a motor casin(Y having an inlet andexhaust chamber therein, a main inlet port from said chamber to themotor, a. main exhaust port from the motor to the exhaust chamber, aseries of auxiliary exhaust ports forming advancing exhaust ports fromthe motor to the exhaust chamber, a detachable double piston mountedupon said shaft, and a series of drivers or swinging valves mounted inthe pockets in the casing, the pressure upon said valves due to theexhaust of the motor being relieved when each Valve passes the auxiliaryor advancing exhaust ports.

5. ln a rotary pressure motor, a motor shaft having twonon-comnuinicating chambers therein providing for the inlet and theexhaust to and from the motor, a main inlet port from said chamber tothe motor, a main exhaust port and a series ol' advancing auxiliaryexhaust ports `from the motor to the ex haust Chamber, a double pistondetaehably supported upon said shalt and having a portion projected intothe main inlet port and forming a connection between the piston and theshaft, and a series of drivers or swinging valves mounted in the Casingoll the motor, each ol' said valves Consisting of two meinbers flexiblyconnected, and means exerting an inward pressure on each of said valves.

6. ln a rotary pressure motor, a motor sha'lt having inlet and exhaustchambers with inlet and exhaust ports, in combination with a doublepiston detaohably mounted on said shaft between said inlet and exhaustports, said piston having a portion thereof extended into the inlet portin the shalt and engaging an edge o'l' said port, and thus 'forming aconnection between one side of the piston and the sha'l't.

ln testimony whereof I al'ix my signature, in presence of two witnesses,

PETER T. COFFIELD.

itnesses C. M. THEOBALD, R. J. MCCARTY.

